Computer Science – Sound
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.6443m&link_type=abstract
Journal of Geophysical Research, vol. 84, Nov. 1, 1979, p. 6443-6450.
Computer Science
Sound
2
Auroral Zones, Energetic Particles, Magnetospheric Ion Density, Night Sky, Positive Ions, Rocket Sounding, Helium Ions, Hydrogen Ions, Mass Spectroscopy, Oxygen Ions, Plasma Dynamics, Rocket-Borne Instruments
Scientific paper
The present paper deals with species-identifying distribution function measurements of auroral primary particles, made during a magnetically quiet presubstorm period above a hydrogen-associated diffuse aurora. Only ions identified as H(+) and He(++) were detected. In the mass spectrum data, the He(++) was not clearly above background. At energies between 2.5 and 12 keV, the He(++)/H(+) intensity ratio had an upper limit of 2 to 4 percent. The same upper limit applies to all other ions, such as He(+) and O(+). Though this would suggest a solar wind source for these ions, an admixture including an appreciable fraction of polar wind protons is not precluded. This situation contrasts sharply with a number of recently reported observations of large intensities of precipitating O(+) ions during magnetic storms, and may be characteristic of undisturbed periods.
Evans Silvan D.
Moore Thomas Earle
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